基于Pushover方法的单自由度结构抗震易损性分析

发布时间：2018-01-14 20:21

本文关键词：基于Pushover方法的单自由度结构抗震易损性分析　出处：《大连理工大学》2014年博士论文　论文类型：学位论文

【摘要】：结构易损性分析是目前国内外研究的热点问题。对结构进行易损性分析可以有效地评估新建结构和已有结构的抗震能力,减轻地震灾害,对已有结构提出合理的加固维修决策。以易损性曲线的形式描述结构易损性是一种被广泛采用的方法。建立易损性曲线有多种方法,目前应用较多的是非线性动力时程分析方法。该方法过程繁琐,计算量很大,在工程应用中费时费力。鉴于此,本文在查阅大量国内外文献,在国内外已有研究成果的基础上,开展了基于Pushover的单自由度体系结构易损性分析方法研究。主要研究内容如下： 1、对单自由度体系结构在构造的正弦波、拟合于规范反应谱的地震波以及记录的EL-centro波和唐山波单条地震波作用下进行弹塑性时程分析和Pushover分析。分析了不同Pushover方法分析结果与弹塑性时程分析结果的差别,对不同Pushover分析进行了评价 2、选择多条真实记录的地震波进行弹塑性动力时程分析,并通过弹性时程分析建立弹性加速度反应谱,采用该反应谱对相同结构进行Pushover分析。从统计角度研究了弹塑性时程分析结果与Pushover分析结果之比的关系,考虑了地震动不确定性影响。 3、采用Monte-Carlo方法生成多个单自由度结构,对这些结构采用基于Takeda模型和Kinematic模型的能力谱法及N2法进行Pushover分析,并对分析结果进行统计分析,得到由结构参数随机性引起的Pushover分析结果的统计规律。 4、提出了基于Pushover的单自由度结构易损性分析方法,对采用该方法得到的易损性与Monte-Carlo方法计算的结果进行比较。 5、以一预应力混凝土连续刚构桥和受腐蚀钢筋混凝土桥梁的易损性为例,说明了本文提出的基于Pushover的单自由度体系结构易损性分析方法的应用。
[Abstract]:Structural vulnerability analysis is a hot issue at home and abroad. Vulnerability analysis of structures can effectively evaluate the seismic capacity of new structures and existing structures, and reduce earthquake disasters. A reasonable reinforcement and maintenance decision is put forward for the existing structures. It is a widely used method to describe the structural vulnerability in the form of the vulnerability curve. There are many methods to establish the vulnerability curve. At present, the nonlinear dynamic time-history analysis method is widely used. The process of this method is tedious, the calculation is very heavy, and it is time-consuming and laborious in engineering application. In view of this, this paper is consulting a large number of domestic and foreign literature. Based on the existing research results at home and abroad, the vulnerability analysis method of single-degree-of-freedom architecture based on Pushover is studied. The main contents are as follows: 1. For the single degree of freedom system structure in the construction of sine wave. The elastic-plastic time-history analysis and Pushover analysis of seismic waves fitted to the normative response spectrum and the recorded EL-centro waves and Tangshan waves under the action of single strip seismic waves are carried out. Different Pusho are analyzed. The difference between the ver method and the elastic-plastic time history analysis. Different Pushover analysis was evaluated. (2) Elastoplastic dynamic time-history analysis is carried out by selecting several real seismic waves, and elastic acceleration response spectrum is established by elastic time-history analysis. The Pushover analysis of the same structure is carried out by using the response spectrum. The relationship between the results of elastic-plastic time-history analysis and that of Pushover analysis is studied from the statistical point of view. The effect of ground motion uncertainty is considered. 3. Monte-Carlo method is used to generate multiple single-degree-of-freedom structures. The Pushover analysis of these structures is carried out by using the capability spectrum method and N2 method based on Takeda model and Kinematic model, and the results are statistically analyzed. The statistical rules of Pushover analysis results caused by the randomness of structural parameters are obtained. 4. The vulnerability analysis method of single degree of freedom structure based on Pushover is proposed, and the results obtained by this method are compared with the results obtained by Monte-Carlo method. 5. Take the vulnerability of a prestressed concrete continuous rigid frame bridge and corroded reinforced concrete bridge as an example. The application of vulnerability analysis method of single degree of freedom architecture based on Pushover proposed in this paper is explained.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU352.11

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